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Astro Hog by Andy Green

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Andy Green13/01/2012 13:39:41
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2279 forum posts
67 photos
2 articles
Well with the Super 60 nearly done, I'm going to turn my attention to the Astro Hog build.
 
My first impressions of the kit (Santa bought be) was very good, but on closer inspection the balsa is quite old.
 
Its difficult to explain unless you have experience of old balsa, but it goes brittle-ish.
 
I think I might have to change my engine choice. I have an old OS 60 FS but its a bit bigger than I remember, so I might fit a Saito 62 I have waiting for e new home.
 
I'll post more when the build starts proper and I have something to show.
 
Andy
 
 
 
 
 
 
Martyn K13/01/2012 23:40:52
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4805 forum posts
3498 photos
Good luck Andy,

Looking forward to see your progress.

Martyn
ntsmith08/02/2012 21:50:28
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264 forum posts
127 photos
This looks a very ineresting choice. I'm going to follow this with interest.
Andy Green09/02/2012 07:45:38
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2279 forum posts
67 photos
2 articles
As usual there will be more photos and descriptions on my website.
 
I have decided to build as a tail dragger, have a servo in each wing, which then gives me the option of using the kit torque rods for flaps - any comments, and a servo tucked under the tailplane for elevator.
 


Rear fuselage mod to take the elevator servo.
 
Andy
 

ntsmith09/02/2012 08:15:48
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264 forum posts
127 photos
Andy, I was just reading your very nice website blog of the super sixty where you mention a "perma-grit spar slotter". What exactly is that?
Andy Green09/02/2012 08:21:58
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2279 forum posts
67 photos
2 articles
They are a set width (1/8, 1/4, 3/16) piece of steel bar with abrasive on one side.
 
Permagrit ones here, or you can glue some sanding paper onto some stock wood.
 
Andy
Andy Green09/02/2012 08:25:13
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2279 forum posts
67 photos
2 articles
Here's one
 

Andy
Martyn K09/02/2012 10:12:47
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4805 forum posts
3498 photos
Hi Andy
 
Been looking at the website. Have you moved the front former to allow for the bigger engine? I am not sure what engine is recommended by SIG, perhaps you can let us know.
 
How is the (not-so-old) ticker BTW?
 
Martyn
Andy Green09/02/2012 10:44:55
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2279 forum posts
67 photos
2 articles
Stock build Martyn, except for my changes.
 
SIG suggest a .60 four stroke, the old OS is a big lump for what it is, hence the change to the Saito, its 2/3 the size.
 
Ticker OK thanks, especially with my new radio to aid convalescence.
 
Andy
 
 
Martyn K09/02/2012 11:13:25
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4805 forum posts
3498 photos
Hi Andy
 
Thanks.. that makes sense. I used a lump so had to move the former.
 
I saw your tweet regarding the new aid to recovery. Makes life worth living
 
Take care
 
Martyn
Andy Green10/02/2012 11:58:11
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2279 forum posts
67 photos
2 articles
Fuselage in jig, I have also kept it held firm in the jig while the top sheeting is applied.
 
F1 at this stage has the captive nuts for the enging mount.
 
One advantage of the cold weather is even 5 min epoxy has some working time.
 
 

 
Martyn K10/02/2012 13:11:46
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4805 forum posts
3498 photos
Hi Andy
 
I do like the jig.. where did that come from?
 
It looks like the top rear decking is going on in two pieces, that is different to mine - I had to plank mine, I had a strange compound curve at the front of the top decking. I don't think that this was intentional though..
 
Looking good
 
Martyn

Edited By Martyn K on 10/02/2012 13:12:36

Andy Green10/02/2012 13:22:01
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2279 forum posts
67 photos
2 articles
Thanks Martyn,
 
The jig was build by a guy in Bournemouth, who is no longer with us I'm afraid.
 
Both the front & rear decking are in 2 pieces (4 in total), There is a compound curve just behind the cockpit, but is covered by the front sheeting, it seems to fit because the cockpit cutout gives you just enough movement to make it fit.
 
I have the first stages of the wings done too, I'll post a bit later.
 
Andy

Edited By Andy Green on 10/02/2012 13:22:25

Andy Green10/02/2012 13:30:41
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2279 forum posts
67 photos
2 articles
Wing panels made over plans as per instructions, nothing much to note, except I have some triangle fillets on the U/C to rib joints, just to make sure.
 


More to come if it gets warmer
 
Andy
Martyn K10/02/2012 15:00:38
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4805 forum posts
3498 photos
Hi Andy
 
It's coming together very quickly. I'll bet yours is flying before mine..
 
What engine side/down thrust lines do SIG recommend for their variant with a bigger engine?
 
Martyn
Andy Green12/02/2012 22:16:15
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2279 forum posts
67 photos
2 articles
Its been quite nice today, and was able to get some workshop time.
 
Top & bottom sheeting all done, and the nose blocks in place ready for shaping.
 
Inside the nose area I have glassed the tank area and run some glass cloth to join the fuselage side to F1.
 

Andy
Big Bandit13/02/2012 02:03:37
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2436 forum posts
947 photos
Hi Andy,
 
I'm glad to hear that your health is improving. The models coming along well, and I do like the building jig. My kit won't be started now until the garage is converted, so I'll be following your build with interest, especially the undercarriage setup.

Cheers,

Chris.
 
 
 

Andy Green16/02/2012 09:16:31
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2279 forum posts
67 photos
2 articles
The first picture shows just how many clamps are needed to hold the wingtips whilst the glue dries. I used white glue for gluing to the spars, but around the tip I used Gorilla glue, this expands and will fill any gap between the sheeting and the tip structure. This just means if I sand a bit too hard and go through the wood, there will be something there.
 

These pictures show the forward mounted undercarriage block. No mention is made of how to sheet this forward position in the instructions, I just placed the sheeting on and drew around the block. I then added some 1/8 strip around the sheeting to make sure the block / sheeting joint was secure.
 
When I join the wings, the external area will get a strip of glass cloth covering, to just make sure its secure. You dont get that on ARTF's
 


Andy
 
Andy Green16/02/2012 09:19:37
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2279 forum posts
67 photos
2 articles
My method for fitting the wing servos is to have 2 1/8 lite ply half ribs, glued each side of a main rib. This worked well on the Super 60. I does mean that the servo is built into the wing which makes maintenance harder, but I can count the times on 1 hand that I've had a servo failure in 30 years of R/C.
 

This picture shows the wing panel with the bottom sheeting, you can just see the servo hole in the rib at the top. I'll make some servo extensions and get the servos fitted while I have full access.

 
I'm going to be using Hi Tec 225MG servos.
 
Andy
Martyn K16/02/2012 13:00:46
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4805 forum posts
3498 photos

Hi Andy

Looking at the website photos, I presume that you are using Strip Ailerons? Is that correct? Hpw wide are they?

Martyn

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